KR100350122B1 - Method for feed back controlling of automatic transmission of vehicle - Google Patents

Abstract

For the purpose of repeatedly applying the maximum or minimum duty once for a predetermined period or repeatedly if necessary in place of the P-gain control in the feedback control during the power-on-up shift control of the automatic transmission;

Setting a feedback start duty and resetting a counter variable if feedback control is started during power-up shift shifting; Comparing the actual turbine change rate with the target turbine change rate; If the actual turbine change rate is smaller than the target turbine change rate in the step, comparing and determining whether the counter variable value is greater than zero and smaller than a predetermined set variable value; If the counter variable value is zero or greater than or equal to a predetermined set value, outputting the duty at 100% for a predetermined time and comparing and determining whether the counter variable is equal to the predetermined set value; ; In the above step, if the counter variable is equal to a predetermined setting variable value, the counter variable is reset, the duty is corrected and outputted by I_gain, the counter variable is sequentially raised, and the comparison is determined whether the feedback control termination condition is met. Wow; Returning to the actual turbine change rate and the target turbine change rate comparing step if the feedback control end condition is not included in the above step; If the feedback control termination condition in the above step, the step of ending the feedback control to return to the step of performing a predetermined power-up shift shifting, so that the response of the hydraulic formation is improved, unnecessary hydraulic surging is prevented, the shift feeling There is an effect to be improved.

Description

Feedback control method of automatic transmission for vehicles {METHOD FOR FEED BACK CONTROLLING OF AUTOMATIC TRANSMISSION OF VEHICLE}

The present invention relates to an automatic transmission for a vehicle, and more particularly, to a feedback control method for an automatic transmission for a vehicle for changing a feedback control method during shift control of an automatic transmission.

For example, the automatic transmission applied to a vehicle is controlled by the shift control device controlling a plurality of solenoid valves to control hydraulic pressure according to the driving speed of the vehicle, the opening ratio of the throttle valve, and various detection conditions. To make the shift.

When the shift is made while driving in the automatic transmission vehicle, the shift is conventionally performed according to a preset duty control pattern, and among them, PI and Proportional and Interral (PI) control are used.

However, since the PI control has a delay in pressure change due to the hydraulic characteristics of the automatic transmission, when the P-gain is largely set to improve the response as shown in FIG. 4A, the pressure is more than necessary after the delay time. The problem is caused by excessively changing the pressure surging caused by the control.

In addition, when the P-gain is set to a small value, as shown in FIG. 4B, the responsiveness is slow, and thus, there is a disadvantage in control.

Accordingly, an object of the present invention for solving the above problems, the hydraulic pressure by applying the maximum or minimum duty once or repeatedly if necessary for a predetermined period in place of the P-gain control in the feedback control of the shift control of the automatic transmission An object of the present invention is to provide a feedback control method of an automatic transmission for a vehicle for improving the responsiveness of formation and preventing unnecessary hydraulic surging.

1 is a block diagram of a feedback control device of an automatic transmission for a vehicle applied to the present invention;

2 is a flowchart illustrating a method for controlling a feedback of an automatic transmission for a vehicle according to the present invention;

3A and 3B are diagrams of a duty pattern during feedback control of an automatic transmission for a vehicle applied to the present invention;

4A and 4B are duty pattern diagrams for feedback control of a conventional automatic transmission for a vehicle.

According to an aspect of the present invention, there is provided a method including: setting a feedback start duty and resetting a counter variable when feedback control is started during power-up upshift; Comparing the actual turbine change rate with the target turbine change rate; If the actual turbine change rate is smaller than the target turbine change rate in the step, comparing and determining whether the counter variable value is greater than zero and smaller than a predetermined set variable value; Outputting a duty at 100% for a predetermined time when the counter variable value is 0 or a predetermined setting variable value, and comparing and determining whether the counter variable is equal to the predetermined setting variable value; In the above step, if the counter variable is equal to the predetermined setting variable value, the counter variable is reset, the duty is corrected and outputted by I_gain, the counter variable is sequentially increased by 1, and the feedback control end condition is compared and judged. Making a step; Returning to the actual turbine change rate and the target turbine change rate comparing step if the feedback control end condition is not included in the above step; If the feedback control termination condition in the above step, it is characterized in that the step of ending the feedback control to return to the step of performing a predetermined power on up shift shift.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can realize the above object will be described in detail.

1 is a block diagram illustrating a configuration of a feedback control device for an automatic transmission for a vehicle according to the present invention, wherein a throttle valve opening amount 11, an output rotational speed 12, an accelerator pedal switch 13 varying according to a driving state of a vehicle, Vehicle running state detecting means 10 for detecting changes in oil temperature 14, shift lever position 15, engine speed 16, and turbine speed detecting unit 17, and the vehicle running state detecting means 10. When the feedback control is started during the power-up shift shift by receiving the vehicle driving state signal detected at, the feedback start duty is set, the counter variable is reset, the actual turbine change rate is compared with the target turbine change rate, and the actual turbine change rate is determined. When the counter variable value is smaller than the target turbine change rate, the counter variable value is greater than zero and smaller than the predetermined set variable value, and the counter variable value is 0 or the predetermined set variable value is smaller. Output at 100% for a predetermined time, compare and determine whether the counter variable is equal to the predetermined setting variable value, and if the counter variable is equal to the predetermined setting variable value, reset the counter variable, and then set the duty to I_gain. After correcting and outputting, increasing the counter variable one by one, and comparing and determining whether or not the feedback control termination condition is reached, if not the feedback control termination condition, returning to the actual turbine change rate and target turbine change rate comparison step, and ending the feedback control. If it is a condition, shift control means 20 which complete | finishes feedback control and performs predetermined power-on-up shift shifting, and a predetermined | prescribed feedback control signal output from the said shift control means 20 are made into a target shift stage. It consists of the drive means 30 which performs a shift.

A feedback control method for an automatic transmission for a vehicle having the above configuration will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a method of controlling a shift of an automatic transmission according to the present invention, and FIG. 3A is a duty pattern diagram of feedback control of an automatic transmission for a vehicle according to the present invention.

As shown in Fig. 2, in a vehicle equipped with an automatic transmission in which a shift stage is automatically shifted according to a driver's operation state, the shift control means 20 for controlling the automatic transmission by a preset program is powered on. When the feedback control is started during the shift shift, a predetermined control signal is output to the vehicle driving state detecting means 10 (S100).

Accordingly, the vehicle driving state detecting means 10 includes a throttle valve opening degree detection unit 11, an output side rotation speed detection unit 12, an accelerator pedal switch detection unit 13, an oil temperature detection unit 14, and a shift lever position detection unit ( 15), the throttle valve opening amount Th detected from the engine speed detection unit 16 and the turbine speed detection unit 17, the output side rotation speed No, the on / off state of the accelerator pedal switch, the oil temperature ATF, The detection values of the shift lever position state, the engine speed Ne, and the turbine speed Nt are transmitted to the shift control means 20.

Accordingly, the shift control means 20 is the throttle valve opening amount Th, the output side rotation speed No, the on / off state of the accelerator pedal switch, the oil temperature ATF, inputted from the vehicle driving state detection means 10, The detection value of the shift lever position state, the engine speed Ne and the turbine speed is received and read, the final duty before the feedback control is set to the feedback start duty D, and the counter variable N is reset (S110). ).

Subsequently, the shift control means 20 compares and determines whether the actual turbine speed change amount dNt is larger than the target turbine speed change amount dNtobj (S120).

When it is determined in the above that the actual turbine speed change amount dNt is smaller than the target turbine speed change amount dNtobj, the shift control means 20 has a counter variable N greater than 0 and functions as a throttle opening degree and a turbine speed. In operation S200, it is determined whether the value is smaller than the predetermined setting variable Z.

When the counter variable N is 0 or smaller than the predetermined setting variable Z, the duty is output at 100% for a predetermined setting time (X sec) (S210).

Subsequently, the shift control means 20 compares and determines whether the counter variable N is equal to the predetermined setting variable Z (S220).

If it is determined that the counter variable N is equal to the predetermined setting variable Z, the shift control means 20 resets the counter variable N (S230), and adds the duty to I_gain to compensate (D = D + I_gain), the corrected duty is output to the driving means 30, and then the counter variable is sequentially increased (S240).

However, when the counter variable N is larger than zero, smaller than the predetermined setting variable Z set as a function of the throttle opening degree and the turbine rotation speed, and the counter variable N is smaller than the predetermined setting variable Z. In this case, the shift control means 20 adds the duty to I_gain to correct (D = D + I_gain), outputs the corrected duty to the driving means 30, and then sequentially increases the counter variable. (S240) to sequentially increase the duty.

Subsequently, the shift control means 20 compares and determines whether the feedback control termination condition is satisfied (S400).

If the feedback end condition is not satisfied in the above, the shift control means 20 returns to the comparison determination step (S120) whether the actual turbine speed change amount dNt is greater than the target turbine speed change amount dNtobj and the turbine change rate. Continue the case where the target turbine change rate difference is small.

Thus, by applying the maximum duty for a predetermined period, as shown in Figure 3a, the hydraulic rise is fast, the response is advantageous, and after the maximum duty of the predetermined period, only the I_gain acts to smoothly increase the hydraulic pressure Pressure surging can be prevented.

However, when the difference between the turbine change rate dNt and the target turbine change rate dNtobj is large, that is, when it is determined in step S120 that the actual turbine speed change amount dNt is larger than the target turbine speed change amount dNtobj. The shift control means 20 compares and determines whether the counter variable N is larger than zero and smaller than a predetermined set variable Z set as a function of the throttle opening degree and the turbine rotational speed (S300).

When the counter variable N is 0 or smaller than the predetermined setting variable Z, the duty is outputted at 0% for a predetermined setting time Y sec (S310).

Subsequently, the shift control means 20 compares and determines whether the counter variable N is equal to the predetermined setting variable Z (S320).

If it is determined that the counter variable N is equal to the predetermined setting variable Z, the shift control means 20 resets the counter variable N (S330), and subtracts the duty by I_gain to compensate (D = D). After the I_gain, the corrected duty is output to the driving means 30, and then the counter variable is sequentially increased (S340).

However, when the counter variable N is larger than zero, smaller than the predetermined setting variable Z set as a function of the throttle opening degree and the turbine rotation speed, and the counter variable N is smaller than the predetermined setting variable Z. In this case, the shift control means 20 subtracts the duty by I_gain, corrects (D = D-I_gain), outputs the corrected duty to the driving means 30, and then sequentially increases the counter variable. In step S340, the duty is sequentially increased.

Subsequently, the shift control means 20 compares and determines whether the feedback control termination condition is satisfied (S400).

If the feedback end condition is not satisfied in the above, the shift control means 20 returns to the comparison determination step (S120) whether the actual turbine speed change amount dNt is greater than the target turbine speed change amount dNtobj and the turbine change rate. Continue the case where the target turbine change rate difference is small.

Thus, as shown in FIG. 3B, when the change in hydraulic pressure is large, the maximum duty is repeatedly applied at a predetermined cycle.

As described above, in the feedback control method of the automatic transmission for a vehicle according to the embodiment of the present invention, the maximum or minimum duty is replaced once during a predetermined period in place of the P-gain control during the feedback control during the power-on-up shift control of the automatic transmission. Alternatively, if repeatedly applied as necessary, the response of hydraulic pressure formation is improved, unnecessary hydraulic surging is prevented, and the shifting feeling is improved.

Claims (12)

delete delete delete delete In the feedback control method of the automatic transmission for a vehicle, Performing feedback control by setting a feedback start duty to a final duty before the feedback control when the feedback control is started during the power-up upshift shifting in the vehicle on which the vehicle is driven; Comparing the actual turbine speed change rate with the target turbine speed change rate and controlling the maximum and minimum duty at predetermined cycles; If the turbine change rate is smaller than a target turbine change rate, outputting a limited maximum value once in a predetermined period; When the actual turbine change rate is greater than a target turbine change rate, comparing and determining whether a counter variable value is greater than zero and smaller than a predetermined set variable value; Outputting the duty at 0% for a predetermined time when the counter variable value is zero or greater than or equal to the predetermined setting variable value, and comparing and determining whether the counter variable is equal to the predetermined setting variable value; When the counter variable is equal to a predetermined set variable value, resetting the counter variable, then outputting a duty correction and raising the counter variable sequentially; The feedback control method of the automatic transmission for a vehicle comprising the step of determining the end of the feedback control. The feedback control of the automatic transmission for a vehicle according to claim 5, wherein when the counter variable value is larger than zero and smaller than the predetermined set variable value, the duty cycle is corrected and output, and the counter variable is sequentially raised. Way. 6. The method of claim 5, wherein when the counter variable is not equal to a predetermined set value, the duty cycle is corrected and output, and the counter variable is sequentially raised. 8. The feedback control method according to any one of claims 5, 6 and 7, wherein the duty cycle correction is performed by subtracting the duty by I_gain. The feedback of the automatic transmission for a vehicle according to claim 5, wherein when the counter variable value is greater than zero and smaller than a predetermined set variable value, the duty cycle is corrected and output, and the counter variable is sequentially raised. Control method. 6. The method of claim 5, wherein when the counter variable is not equal to a predetermined set value, the duty cycle is corrected and output, and the counter variable is sequentially raised. The method of claim 9 or 10, wherein the duty cycle correction is performed by adding a duty to I_gain to correct the feedback. A method according to any one of claims 5, 6, 7, 9 and 10, wherein the predetermined setting variable is a function of the throttle valve opening rate and the turbine rotational speed.